Expansion anchor for bolts



EXPANSION ANCHOR POR Bows Filed SepLl?, 1927 y Z0 i 1 1h .1. f/ VIPatented Apr. 23, 1929.

UNITED STATES JOHN W. HOOLEY, 0F LARCHMONT, NEW YORK.

EXPANSION ANCHOR FOR BOLTS.

Application filed September 17, 192'?. Serial No. 220,181.

This invention relates to means for acilitating the secure mounting ofbolts or the equivalents thereof in hard materials such as masonry orconcrete Work, and has particular reference to the structure ot' theshell ot' a bolt or screw-receiving anchor and a cooperating member toexpand said shell and hold both the shell and the expanding memberfirmly in position ready to receive a` bolt or screw at any time.

Heretofore, so i'ar as I am aware, expansion shields or devices forenabling bolts to be mounted in holes in masonry or concrete work,depend upon the bolts themselves to eifect and maintain the expansionmembers securely in the holes. Several objections exist. to suchstructures. For instance, an article which is to be installed by meansof the bolt may not be at hand, or may be of such thickness that itspresence between the head of the bolt and the outer end of the anchormay be such as to prevent the bolt from being screwed in iar enough toeffect proper expansion of the anchor to interlock it with the interiorof the masonry hole.

The principal object of my present invention is to provide devices ofthis general character which can be pre-set firmly in position beforeemployment of a` cooperating bolt, thereby avoiding any necessity ofconnecting an article with the bolt which is to hold it until anyconvenient time after the anchor has been securely fixed in position.

lVith the above mentioned object in view, my invention consists in theconstruction and combination of parts substantially as here inafterdescribed and claimed.

Uit the accompanying drawings:

Figure 1 represents a longitudinal section of my improved anchor andwith a bolt, in the relative positions which they occupy in use, butomitting any object or article supported or held by the bolt.

Figures 2 and 3 are, respectively, end and side elevations of theexpansible shell or sleeve.

Figures 4 and 5 are side views respectively of the expanding plug and abolt which may be mounted in position at any time.

Figure 6 is a side view of a suitable tool which may be temporarilyemployed for effecting the expansion operation.

Similar reference numerals indicate simi lar )arts or features in all ofthe views.

T e cylindrical sleeve or shell 10 is provided with externallongitudinal ribs 11,

and is slitted as at 12. At one end it is internally tapered, as at 13,and has internal left hand screw threads 14.

The plug member which efects expansion of the shell 1() is wedge-taperedat 15 correspending with the ta ered portion 13 of the shell, and isleft-lnindthreaded at 16. Said plug member has an axial aperture whichis right-hand threaded as at 17.

A suitable tool for temporary use is `illust-rated by Figure 6 andcomprises a shank 18 having a handle 19 and right-hand threaded at 20. l

In use, after a hole has been formed in the usual'manner in the masonryor concrete, the shell'10, with the plug contained therein far enough toremain Without effecting expansion of the shell, is inserted in saidhole. Then the tool 6) is screwed into the plug far enough to draw theportion 15 oit the plug into the tapered portion 13 of the shell andexpand the latter into lirm connection with the wall of the` ma-` sonryhole. Such operation of the tool rotates the plug, but the left-handthreads 14, 16, permit the plug to shift in the proper direction intothe shell to effect expansion of the latter, said left-hand threads thenmaintaining the plug in the position to which it has been drawn duringand after removal ot the temporary tool, the sleeve or shell 10remaining locked in the masonry hole ready to receive a bolt suchillustrated by Figure 5.

It will now he understood that since the bolt itseli' is not required toefeet expansion, any member which is threaded to correspond with theinternal threads 17 of the plug can be employed to connect an ar ticleor object with the anchor locked in the masonry hole, and such threadedmember can be utilized at any time for its purpose, and can be scri-:wedin any distance according to the article that is to be supported,without ail'ecting in any way the relative positions of the expandedshell and its contained plug. And if for any reason it is desired todetach the supported article or object, removal of the bolt orequivalent screw will not cause any loosening ot the hold which theanchor has in its masonry hole, said anchor remaining firmly in position to again receive the bolt. i

I do not limit myself to a construction requiring the employment of sucha tool as illustrated by Figure 6, to eieet movement threaded portion,and a plug member having a wedge-shaped portion engaging said lapcredportion and an outer threaded portion engaging and cooperating with saidscrew threaded portion of the shell member, said plug member having alongitudinal aperture threaded to be engaged by a setting tool and uponits removal by a bolt, the outer and inner threads of the plug memberbeing in opposite directions.

In testimony whereof I have aiixed my 25 signature.

JOHN W. HOOLEY.

